Hello Sebastien, I’m sorry to hear that you are having issues with the installation of the SSD and your NUC.
I'm not sure why your NUC is not recognizing the mSATA. This is the list of peripherals for the NUC you are trying to use. The SSD you are using is not on the list, however we cannot guarantee it is a compatibility issue.
The latest BIOS version available for this device is 0027; since you already have this version installed, you can try rolling it back to a previous version just for testing.
If the problem persists, please contact our customer support department for additional information on replacing your product